INTRODUCTION

DHM3Z DC molded case circuit breaker is an electrical device specially designed to protect DC circuits in photovoltaic energy storage systems. It plays a role in cutting off and protecting battery circuits in photovoltaic energy storage systems, ensuring the safe operation of the system and preventing circuit failures from causing fire and other hazards.

The maximum current of this DC circuit breaker can be reach 800A, and the maximum working voltage is 1500VDC. It has the characteristics of small size, high breaking capacity, short flashover, vibration resistance, and strong arc extinguishing ability, making it an ideal product for high-power battery energy storage systems. The design of this DC molded case circuit breakers takes into account the special needs of photovoltaic power generation and energy storage systems.  It uses high-strength plastic shell materials, with good insulation performance and protective functions to adapt to outdoor environments and harsh weather conditions. In addition, it also has the characteristics of fast disconnection and action response to protect the photovoltaic energy storage system from overload, short circuit, and ground fault conditions.

The DC molded case circuit breaker is equipped with overload protection and short circuit protection functions. When the current in the photovoltaic energy storage system exceeds the rated value, overload protection will trigger the action of the circuit breaker to prevent circuit overload damage. When a short circuit fault occurs in the circuit, the short circuit protection will quickly cut off the current to prevent danger such as fire.

DC molded case circuit breakers have long service life and high reliability. It adopts high-quality materials and advanced manufacturing processes, with characteristics such as earthquake resistance, moisture resistance, and high temperature resistance, and is suitable for various harsh environmental conditions. At the same time, it also passes strict testing and certification to ensure its stable and reliable performance.

DC molded case circuit breaker is an electrical device used to protect DC circuits in photovoltaic energy storage systems. It has high strength plastic casing, overload and short circuit protection functions, long service life, and high reliability. It is suitable for high current environments in photovoltaic energy storage systems and can ensure the safe operation of the system and prevent hazards such as fires.

DHM3Z DC molded case circuit breakers are widely used in photovoltaic power generation and energy storage systems, wind power generation , as well as small energy storage cabinets/UPS and other high current applications.

Features

Meaning of Model Designation

CLASSIFICATION

ELECTRICAL TECHNICAL PARAMETERS

Appearance
Model	DHM3Z-125	DHM3Z-320	DHM3Z-400		DHM3Z-800
Poles	2	2	2		2
Rated Voltage Ue(V)DC	1000	1000	1000	1500	1000	1500
Insulation Voltage Ui(V)	1000	1250	1500		1500
Rated Impulse Withstand Voltage Uimp(kV)	8	8	12		12
Rated Current In(A)	63,80,100,125	160,200,250,300,320	350,400		500,630,700,800
Rated Operating Short-Circuit Breaking Capacity Icu(kA)	20	20	40	20	40	20
Rated Breaking Capacity Ics(kA)	lcs=100%Icu
Connection	Up in and down out, down in and up out
Use Category	A
Isolation Function	Yes
Ambient Temperature	-35°C ~ +70°C
Mechanical Life	20000	20000	10000		5000
Electrical Life	2000	2000	1000	700	1000	700
Standards	IEC/EN 60947-2 , GB/T 14048.2
Accessories	Shunt Tripping Device, Auxiliary Contacts, Alarm Contacts, Motor-operated Drive,Hand Control Mechanism
Certificates	CCC. CB. CE. TüVtututu
Dimensions	150x65x95(2P) (L×W×H)	180x75x125(2P) (L×W×H)	250x125x170(2P) (L×W×H)		250x125x170(2P) (L×W×H)

TEMPERATURE COMPENSATION COEFFICIENT

ALTITUDE COMPENSATION COEFFICIENT

TRIPPING CHARACTERISTIC CURVE

RELEASE DEVICE AND ATTACHMENTS CODE

Attachments Code	Attachments	DHM3Z-320	DHM3Z-400/800
300	No Internal Attachments	--	--
3.8	Alarm Contact
310	Shunt Tripping Device
302	Auxiliary Contact (2NO2NC)	--

AUXILIARY CONTACT (CURRENT PARAMETERS)

AUXILIARY CONTACT (CURRENT PARAMETERS)

When the circuit breaker is in the "open" position
When the circuit breaker is in the "close” position

ALARM CONTACTS AND THEIR COMBINATIONS

Alarm contacts(Ue=220V , Ith=3A)
When the circuit breaker is in the "open" and "close" positions
When the circuit breaker is in the "trip-free” position

SHUNT TRIPPING DEVICE

Generally installed in phase A of the circuit breaker, when the rated control power voltage is between 70% -110%, the shunt tripping device should reliably trip the circuit breaker under all operating conditions.   Conventional control voltage: DC 24V. Note: When the control circuit power supply is DC24V, it is recommended to use the following diagram for the design of the shunt control circuit.
K: The micro switch connected in series with the coil inside the shunt release is a normally closed contact.   When the circuit breaker is opened, the contact automatically opens and closes when the circuit breaker is closed.

APPEARANCE AND DIMENSIONS

SAFETY DISTANCE DURING CIRCUIT BREAKER INSTALLATION

WIRING DIAGRAM